| Geyser | 1977-07-11 |
|---|---|
| Black Growler | 1200 |
| Echinus | 0910, 1218, 1435 |
| Guardian | 1733 |
| Little Whirligig | 0800 ie, 1020 A |
| Valentine | 1730 |
| Values for Old Faithful Area | 1977-07-11 |
|---|---|
| Astronomical Twilight Begin | 03:29 |
| Nautical Twilight Begin | 04:27 |
| Civil Twilight Begin | 05:13 |
| Sunrise | 05:49 |
| Sunset | 21:08 |
| Civil Twilight End | 21:43 |
| Nautical Twilight End | 22:30 |
| Astronomical Twilight End | 23:28 |
| Moon Illumination | 22.34% |